Automatic stop for sewing-machines



1, SHAPIRO. AUTOMATIC STOP FOR SEWING MACHINES.

APPLlCATlON FILED APR. 23, I919.

Patented Feb. 24, 1920.

2 SHEETSSHEET 1.

I HIHI lllll IIH WITNESSES d TTORIVE Y8 J. SHAPIHU.

AUTOMATIC STOP FOR SEWING MACHINES.

APPLICATION FILED APR.23.1919.

Patented Feb. 24,1920.

2 SHEETS-SHEET' 2.

WITN88ES INVENTOR JACOB SHAPIBO, OF BROOKLYN, NEW YORK.

AUTOMATIC STOP FOB SEWING-MACHINES.

Specification or Letters Patent;

' Application filed April 23, 1919. Serial No. 293,012.

To all whom it ma concern:

Be it known t at I, JACOB SHAPIRO, a

I citizen of the United States, and a resident of the city of New York, borou h of Brooklyn, in the county of Kings and tate of New York, have invented a new and Improved Automatic Stop for Sewing Ma-' chines, of which the following is ,a full, clear, and exact description.

This invention relates to automatic stops,

and particularly to a stop for sewing machines and has for an obJect the provision of means which will automatically operate upon the breaking of the thread of the sewing machine to throw oi the driving power of the machine.

Another object of the invention is to provide a mechanism operated by certain arts of the sewing machme for throwing o the power when the thread 'of the sewing ma-' chine has been broken;

A further object, more specifically, is the provision of a; clutch throwing mechanism operated by a positive movement from cermin of the driven elements of the sewing machine when the same are connected thereto.

- In the accompanying drawings:

Figure 1- is a si e view showin part of the sewing machine with an emb iment of the invention applied thereto. I

Fig. 2 is a fragmentary sectional view through Fig. 1 on line 2-2, the same being on an enlarged scale.

Fig. 3 is a view similar to Fig. 2, but showing the parts in a difierent osition.

Fig. 4 is a view similar to ig. 1, but showing the parts in an operated position.

Fig. 5 is an end view of part of the sewing machine shown in Fig. 4, disclosing the arrangement of levers and clutch.

Fig. 6 isan enlarged fragmentary sectional view showing the connection between certain of the driven parts of the sewing machine and the clutch releasing mechanism.

Referrin to the accompanying drawings by numera s, 1 indicates a sewing machine which may be of any desired type and which 7 is provided with a driving clutch 2 (Fig.

, capa 5) o erated by a belt 3, said cable being ble of movement into and outof engagement with a suitable clutch face arran ed on the pulley 4 operating the belt 5, pass ng over the pulley 6 operat ng the mechanism of the sewing machine. A pivotally act as an idler.

mounted bell crank lever 7 is connected in any suitable manner with the clutch pulley 2 and is thrown into and out of engagement by the operation of an adjustable 0 rating bar structure 8, which is. (preferab y made in two sections and clampe together. This Patented Feb. 24, 1920.

bar section is pivotally connected with the.

lever 9 carrying a chain 10 at the'upper end. This chain is connected to a swingingarm 11 pivotally mounted on the sewmg machine 1 and operated by a late or bar 12. This bar or plate is provi ed with a notch 13 and with an upstanding portion 14 having a slot 15. Extendin the slot 15 is a pin 16' which is ormed mtegralwith or rigidly, secured to a sleeve 17. This sleeve 17 is clamped by any suitable means, as for instance set screw .18 to a rod 19 journaled in the turned over ears or plate 20, also in part of the head 21 of the sewmg machine. The end of the rod-19 on the .face of the head 21 is rovided with a bent up portion 22 and a cur ed-or looped portion 23 through which the thread 24 passes.

The sewing machine is provided with any usual or preferred formfof tension means formmgno part of the present invention,

in order that the line of stitching may be drawn properly and this tension means naturally holds the thread 24 substantially in a straight line and substantially supports the portion 22 and'the eyelet or looped portion 23. As the thread supports these parts it also'holds the rod 19 in a given position which'normally maintains the pin 16 in its elevated position illustrated inEigs. 1 and 2. -When the pin is held in this manner in its elevated position it will in turn hold the plate 12 in the position shown in Fig. 1 whereby the pin 25 connected to arm 26 will be out of contact with the plate 12 and though it swings back and forth under the action of the sewing machine it will merely In order to cause the arm 26 to swing in the manner 'ust described it is rigidly secured to a sha 27 which carries the arm 28, which arm is provided with a pin 29 acting in a cam oove 30, arm 28 and associate parts forming no part of the present invention, per see, as they are old and well known' and are used in recipgocating member 31 also old and well own. The arm 26 is merely connected'with these parts in order to be continuall moved back and forth as the sewing mac e operates,

through so that in case the thread 24 should break the rod 19 would be allowed to rotate under the action caused by gravity acting, on

rod 19 which in turn acts on the pin 16. When the plate 12 is allowed to drop down in this manner the in 25 on arm 26 will strike against the s oulder 32 and will strike a quick sudden blow and will quickly move over the plate 12 and chain 10 as well as the parts associated therewith whereupon the clutch member 2 is unclutched and the power is thereby thrown off of the machine. Usually the blow of pin 25 against shoulder 32 is suflicient to cause the parts to assume the loose position shown in Fig. 4. The clutch will naturally remain unclutched until positively moved back into clutching position, which may be done in an desired manner, as for instance by. wor ing the lever 9. Before this is done, however, the thread 24 is properly adjusted and passed through the needle so as to be ready for proper sewing operation. It is to be noted that the arm 26 swings continually during the operation of the sewing machine while the plate 12 and parts connected therewith remain idle until the thread breaks whereupon it will immediately operate to throw ofi the power.

What I claim is:

1. The combination with a power driven sewing machine provided with a clutch for throwing the power on and off, of a lever associated with said clutch for shifting the same, a flexible member connected with said lever, a plate connected with said flexible member, a constantly swinging arm operated by the mechanism of the sewing machine arranged adjacent said plate and adapted to,

move the plate, flexible member and lever for unclutching said clutch when the plate has been moved downwardly a redetermined distance under the action 0 gravity, and means normally held in a given position by the thread of the sewing machine for holding the plate in an elevated position.

2. The combination with a power driven sewing machine having a clutch, of means for throwing the clutch into and out of engagement, said means including a system of levers, a flexible member, a swinging arm having one end connected with the flexible member, a plate pivotally mounted on said swinging arm, said plate having an elongated notch therein, means for supporting the plate so as to prevent its downward swinging movement under the action of gravity, means controlled by the thread of the sewing machine for holding the sup porting means of the plate in a given position, and a swinging power arm actuated by the mechanism of the sewing machine arran ed beneath said notch and adapted to strifie one end of the plate in the notch when the plate is moved down under the action wardl under the action of gravit of ravity a predetermined distance whereby sai flexible member and arts associated therewith will be. ulledor moving the clutch to an unclutc ed position.

3. The combination with a power driven sewing machine provided with a clutch of normal path and to permit the rod .to move 1 under the action of gravity when the thread is broken, a pin connected with said rod, a pivotally mounted plate formed with a slot through which said pin projects whereby one end of said plate is supported by said pin, said plate having a shoulder, a swinging arm actuated by the mechanism of the sewing machine, said arm being arran ed below. said shoulder and adapted to strike said shoulder when said pin is moved pivotally downwardly for allowing the plate to swing downward whereby the plate is caused to move quickly and open said clutch.

4. The combination with a sewing machine having a clutch for connecting power thereto of means for disconnecting said power, said means comprising a plurality of members for moving said clutch to an 0 en position, said members including a flexi 1e membar, a swinging arm connected with one end of the flexible member, a swinging plate pivotally mounted on the swingin arm, said plate having an elongated notc a swin ing power arm having a pin adapted to t into said notch when said plate moves downwhereby the ate will be pulled and sa1d flexible mem er will be pulled for unclutching said 4 clutch, a pin engaging said plate for normally preventing its downward movement under the action of ravity, and a control rod connected with said pin for holding the same in a given position, said p'in havmg a guide through which the thread of the sewing machine passes and which holds the control rod normally in a given position.

5. The combination with a power driven sewing machine having a. clutch of automatic means for throwing out said clutch,

said means including a flexible member,

mechanism for connecting one end of the flexible member with the clutch, a swinging arm connected with the opposite end of the flexible member, a plate pivotally mounted on said frame, said plate having a notch, a

slot, a swing power member having a pin adapted to St into said notch and thereby move the plate when the plate moves under the action of gravity to a given position, a pin extending through sa1d slot for normally holding said plate in an elevated 1,saa,o71 I 8 position against the action of gravity, and the thread breaks the weight of said parts' a control rod rigidly secured to said pin, will cause said rod .to rotate a sufiicient dissaid control rod having an upwardly extendtance to ermit said plate to drop under the 10 ing portion and an eyelet thereon for holdaction 0? gravity until it engages the pin ing a thread whereby when said thread is on the power arm. movin in its regular course the parts will be held in an operative position; and when JACOB SHAPIRO. 

